This CFD ANSYS Fluent tutorial will demonstrate how to use the VOF multiphase model to simulate the Rayleigh - Taylor instability between 2 fluids with different densities. I will be using the K Omega SST Turbulent model. 

2 main fluids will be used, water and oil at a lower density. Water will be located on top of oil at time = zero

Raef Kobeissi